package com.springbootWebsocket.interceptors;

import com.auth0.jwt.exceptions.AlgorithmMismatchException;
import com.auth0.jwt.exceptions.SignatureVerificationException;
import com.auth0.jwt.exceptions.TokenExpiredException;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.springbootWebsocket.utils.JWTUtils;
import org.springframework.stereotype.Component;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.HashMap;
import java.util.Map;

/**
 * <p>
 *  前端控制器
 * </p>
 *
 * @author 成大事
 * @since 2021-11-23
 */
@Component
public class JWTInterceptor implements HandlerInterceptor {

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {

        String token = request.getHeader("token");
        Map<String, Object> map = new HashMap<>();
        try {
            JWTUtils.verify(token);         //验证令牌
            return true;   //放行请求
        }catch(SignatureVerificationException e){
            e.printStackTrace();
            map.put("msg","无效签名！");
        }catch(TokenExpiredException e){
            e.printStackTrace();
            map.put("msg","token过期！");
        } catch(AlgorithmMismatchException e){
            e.printStackTrace();
            map.put("msg","token算法不一致！");
        }catch(Exception e){
            e.printStackTrace();
            map.put("msg","token无效！");
        }
        map.put("status",false);
        //将map 转为json  jackson
        String json = new ObjectMapper().writeValueAsString(map);

        response.setContentType("application/json;charset=UTF-8");
        response.getWriter().println(json);
        return false;
    }
}
